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Old 12-09-2010, 04:23 PM
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Heater not working?

My 68 chevelle sat for two years during it restoration, and now it is running but the heater is not working, where do u think I should begin to look? Maybe start with checking the fuses or electrical? Not sure where to begin to look, anyone have this problem before? Any help would be appreciated.

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Old 12-09-2010, 04:27 PM
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Quote:
Originally Posted by chevyrally68
My 68 chevelle sat for two years during it restoration, and now it is running but the heater is not working, where do u think I should begin to look? Maybe start with checking the fuses or electrical? Not sure where to begin to look, anyone have this problem before? Any help would be appreciated.
Do you feel any heat at all and is the blower not working or working but still no heat ?



Cole
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Old 12-09-2010, 04:30 PM
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blower is not working
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Old 12-09-2010, 04:38 PM
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First thing as you said check the fuses, That blower location is a "PITA" don't think you can get to it to jump the wires on it to see if it will work. Does the heater controls seem to be working when you move it to set the heater ?



Cole
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Old 12-09-2010, 05:27 PM
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I would try to spin the fan by hand or whatever ,then try it electically.. It may have seized up form lack of use.
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Old 12-09-2010, 05:53 PM
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Quote:
Originally Posted by Cape Cod Bob
I would try to spin the fan by hand or whatever ,then try it electically.. It may have seized up form lack of use.
Bob he will have to get to it before he can spin it. They are really kinda hard to get to.


Cole
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Old 12-09-2010, 09:42 PM
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heater vaccum

hey just read some threads about a vaccum canister on the p****enger side firewall, I did have a vaccum canister mounted there before i remove it during engine removal, and did not put it back on. Maybe this is the problem I am having with my heater not operating. Is this right? I always wondered what this canister was for, could this be the problem. Does the heater need this vaccum canister to initialize operation?
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Old 12-09-2010, 11:34 PM
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ok, first of all, I'm ASSuming the 68 chevelle is similar to the 70-72 monte since they're virtually brothers.

Is your chevelle Non-Air or an A/C car? doesn't matter what it has now.. what did it leave the factory with?

on a monte, (And therefore I believe a chevelle) a NON-air car has the blower resistors mounted in the air box under the dash.

on an a/c car, they're under the hood.

if you have no speeds at all, I would suspect a blown fuse, or a bad motor.

an air car has a high speed relay out under the hood.. does it click when you get to high speed?
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Old 12-09-2010, 11:36 PM
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this chevelle has air con, what do u think about the vaccum canister? Does that have something to do with the heater?
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Old 12-09-2010, 11:46 PM
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nothing to do with your blower motor not running.

that canister simply 'stores' vacuum so that when you are WOT or whatever and there is little engine vacuum available, your A/C controls don't start doing their own thing
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Old 12-09-2010, 11:48 PM
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by the way.. the easiest way to get to the blower motor is to remove the outer fender...

it's possible to do it w/o removing the fender.. but you had better be a contortionist!!!

this is a picture of what you are dealing with.. but w/o all the sheetmetal in the way.. yes, this is my monte carlo, but from the firewall back it's basicly just a fancy chevelle

http://home.comcast.net/~kc8oye/Engine/DSC00219.JPG

Last edited by kc8oye; 12-10-2010 at 12:00 AM.
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Old 12-10-2010, 09:11 AM
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I wouldn't suggest removing the fender untill it's determined that the motor has to be changed...... find the wires and test/jump them.
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Old 12-10-2010, 11:42 AM
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Quote:
Originally Posted by EOD Guy
I wouldn't suggest removing the fender untill it's determined that the motor has to be changed...... find the wires and test/jump them.
sound advice

i don't know about the chevelles.. but I know removing a fully installed monte carlo fender is no small task!
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Old 12-10-2010, 01:12 PM
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I don't know if the '68's were wired like the later vehicles, but on the newer ones an A/C equipped car has a separate high speed blower fuse and a relay mounted under the hood. The 30 amp fuse is inline in a wire running across the firewall, and the relay is mounted next to the blower motor resistors.

If you power up that high speed blower relay by putting 12 volts on the low side, and the 30 amp fuse that feeds the high amp side is good, you can get the blower to run on high even if the dash switch is bad.

Bruce
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Old 12-11-2010, 12:03 AM
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yeah that's how the 70-72 monte's are wired.. and in fact, that's exactly how I use my blower fan right now
i just put a toggle with some pig tails into the harness in the dash tho :>
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